Geoege s



a. s. TIFFANY.

. Brick-Machines.

Patent'ed Oct. 20,1874.

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THE GRAPHIC CO- PHOTD-LITH.39&+I PARK FLACE,N.Y.

UNITED STATES PATENT OFEIGE.

GEORGE s. TIFFANY, or LONDON, oANAnA.

IMPROVEMENT lN BRICK-MACHINES.

Specification forming part of Letters Patent N0. 156,188, dated October20, 1874; application tiled March 18, 1874.

To all whom it may concern:

Be it known that I, GEORGE S. TIFFANY, of London, Canada, have inventedImprovements in Machines for Making Bricks, of which the following is aspecification:

1n the accompanying drawings, Figure l is a perspective view of amachine embodying my invention. Fig. 2 is a central verticallongitudinal section of the same, in which it has not been thoughtnecessary to represent all the gear-wheels. Fig. 3 is a verticalcrosssection taken on the line a a, Fig. 2. Fig. 4 is the plan of ascrew, N, shown in Fig. 2. Fig. 5 is a cross-section on the line b b,Fig. 2, showing the parts toward the grinding-mill.

Like letters indicate like parts in all the figures.

My invention relates to that class of brickmachines which, aftergrinding the clay, force it through a die by means of revolving beatersor screws, and, as it issues from the die, cut it into sections formingbricks.

In all machines of this class, where the mill is in a horizontalposition, the clay is forced through the die by beaters or screwsattached to the grinding-mill shaft.

The first part of my invention consists in forcing the clay through thedie by means of a molding-screw, N, on a shaft, K, which runs through atubular mill-shaft, J, my object being to confine the pressure by whichthe clay is forced through the die more nearly to the area of the die,reduce the strain on the millshaft J and the gearing by which it isdriven, and, as some qualities of clay require less grinding thanothers, to increase the rapidity of molding without increasing the speedof the mill-shaft J, by giving the shaft K greater motion as comparedwith that of shaft J. The cylinder A is supported by and between thefront plate B and head-plate D; The back plate X and head-plate Dfurnish bearings for shafting, and, with shield G, inclose and protectthe gear-wheels; The plates B D X rest upon and are bolted to a suitablebase, I. The molding-shaft K has a bearing in the back plate X, and in acollar, and which is held in position by rods (not represented in thedrawin g) running from it to the cylinder. The millshaft J has a bearingin the head-plate D, and one on the molding-shaft K near the bearing.

It is provided with a gear-wheel, d, a screw, L, similar to screw N, anda number of knives (not represented) spirally arranged between the screwand the head-plate D. The shaft K is driven more rapidly than the shaftJ, and in an opposite direction, and the knives and flanges of thescrews L N are so arranged as to force the clay toward the die when theshafts are made to revolve. The front plate B has a flanged circularopening directly in front of the screw N, over-which is bolted the die0.

The second part of my invention relates to the known device for cuttingoff, in which the rack F moves with the clay in the operation ofcutting, and consists in the use of rockers V V V V as supports for therack F, and also for the purpose of allowing the rack F to be morecompletely governed by the movement of the clay in the operation ofcutting. T T is a track, on which rest the rockers V V V V. The rockersare keyed to two shafts, m m, two on each, that have bearings in thesides of the rack F, all so constructed and arranged as to allow therack F to have a longitudinal reciprocating motion on the rockers V V VV.

Flanged rollers of small diameter set in a frame have been heretoforeused for this purpose. Their diameter could not be increased withoutmaking the frame cumbersome, and the frame required supports. 7

It will be seen that this improvement simplifies construction bydispensing with much of the frame-work, renders the rack F moresusceptible to the required movement, and less liable to vibration.

Fig. 4 represents a suitable arrangement of gearing, which'will beunderstood from the description of the operation of the machine, whichis as follows: Motion being given to the driving-shaft by means of abelt on bandwheel U causes gear-wheelsi and c on same shaft to revolve.Wheel 0 meshes with wheel f on molding-shaft K, and gives motion to thescrew N. Wheel meshes with wheel I) on intermediate shaft, and givesmotion to wheel 0, represented by dotted circle on same shaft and wheel0, meshing with wheel d, gives motion to the grinding-mill shaft J. Thedesired motion being thus given to the grinding and molding parts, clay,properly moistened, is

' die to out again.

thrown into the hopper W, and is ground and forced forward by theheaters on the millshaft J. The more rapid revolution of the screw Ntends to cause a vacuum, on account of which the clay flows the morereadily to the screw N, by which it is taken and forced through the die0 onto the belt I? and rollers of the rack F. The operator of thecut-off holds the rack in position until he wishes to cut, when heallows the rack to move with the clay, and while moving he draws the barof the cutter-frame E over to the opposite side of the rack, causing thewires 6 e, &c., to pass through the clay, cutting it into bricks. Theyare removed and the rack moved toward the The bricks are sufficientlydry and firm to be placed directly in the bake.

I am aware that a screw operated by means of a shaft running through atubular mill-shaft 'GEORGE S. TIFFANY.

Witnesses W. H. BARTRAM, F. E. LEONARD.

